A serious medical condition resulting from being exposed to large amounts of dick pictures whilst sifting through the /b/ on 4chan. A person with 4chan /b/lindess can no longer see dicks as they have been desensitized. It has been reported that some men will look in their pants and see nothing but a small lump.
-Dude. I was on 4chan so much that I think I got 4chan /b/lindness.
-Shit man...Did you try looking in your pants?!